Performance based seismic design of reinforced concrete tall buildings

2017-01-13
Budak, Erhan
Sucuoğlu, Haluk
The need for tall buildings are steadily increasing all over the world, in parallel to the need for new living spaces in large cities. Improvements in technological equipment, material science and analysis methods have opened opportunities to construct new life areas by rising along the vertical direction instead of horizontal. Unlike regular buildings, tall buildings are peculiar due to their specific architectural properties and building configurations. On the other hand, most of these buildings are located in the regions of high seismicity. The behavior of tall buildings under seismic effects is crucial since the contribution of higher mode effects is significant on their dynamic behavior. Seismic response of tall buildings under the effect of seismic loading is one of the most sophisticated problems in earthquake engineering. High strength materials and innovative structural systems are generally employed to resist the unique challenges introduced by these structures in the regions of high seismicity. In this study, the behavior of tall buildings under seismic loading is summarized first by utilizing the performance based seismic design (PBSD) approach since current prescriptive seismic codes are too restrictive and inadequate to understand the anticipated behavior of tall buildings and pursue a reasonable design. Considering all these facts, several institutions and building officials have recently proposed and published alternative consensus guidelines, which are based on performance based design concepts. In this study, all of these issues are addressed. PBSD is commonly conducted by performing nonlinear dynamic analysis (NDA) for tall buildings. PBSD approach is quite sophisticated and a time consuming process, from creating nonlinear modelling to the interpretation of results. However, there are also variety of uncertainties from modelling of the component to the selection of ground motions, and to the definition of performance target levels. This study especially focusses on nonlinear modeling of reinforced concrete shear walls. Finally, a reinforced concrete unsymmetrical-plan tall building with 34 stories is designed in Istanbul according to the Turkish Seismic Code. For both service and maximum earthquake levels, nonlinear time history analysis is employed by using a suite of ground motions for checking the results in compliance with the determined target performance levels. The results have indicated that satisfactory seismic performance can be obtained through the use of performance based seismic design procedures.
Citation Formats
E. Budak and H. Sucuoğlu, “Performance based seismic design of reinforced concrete tall buildings,” presented at the 16th World Conference on Earthquake Engineering, 16WCEE ( 2017), Santiago, Chile, 2017, Accessed: 00, 2021. [Online]. Available: www.16wcee.com.